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サーバーサイド妥当性検査が失敗したらクライアントサイドのアラートを表示する方法

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<xp:label id="label1">
<xp:this.value><![CDATA[#{javascript:/** If there are any messages for this request, run the client-side JavaScript after the viewRoot response is completed **/
if(facesContext.getMessages().hasNext()){
var x="alert('THE DOCUMENT WAS NOT SAVED.\\n\\nAll required fields were not completed or they do not contain valid data.\\n\\nPlease review the fields and correct any errors.');";
view.postScript(x);
}}]]></xp:this.value>
</xp:label>